Cant read plugs saturated with oil.
Todays pump gas does not color the plugs like the pictures in the old books.
Any coloring on todays gas is too rich or oiling, a greyish ash like deposit is all you get when things are right.
Look for changes caused by temperature, blueing or burning of the ground electrode, how far the heat comes up the threads.
Those plugs are not worn, note the sharp corner still present on the center electrode and no erosion on the inside of the ground electrode.
The yellowish brown deposits are a cylinder that was not firing right, did not get hot enough to burn off deposits.

Compression and leakdown test before teardown? Or some further diagnostics before teardown, like swap injectors, plugs, & wires/coils